Whitin Observatory is an astronomical observatory owned and operated by Wellesley College. Built in 1900, with additions in 1906, 1967, and 2010, it is located in Wellesley, Massachusetts and named after Wellesley College trustee Mrs. John Crane Whitin (Sarah Elizabeth Whitin) of Whitinsville, who donated the funds for the observatory. Astronomer Sarah Frances Whiting was the first director of the new Wellesley College Astronomy Department.